/* *****************************************************************
    MESQUITE -- The Mesh Quality Improvement Toolkit

    Copyright 2009 Sandia National Laboratories.  Developed at the
    University of Wisconsin--Madison under SNL contract number
    624796.  The U.S. Government and the University of Wisconsin
    retain certain rights to this software.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    (lgpl.txt) along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    (2009) kraftche@cae.wisc.edu

  ***************************************************************** */

/** \file TPower2.cpp
 *  \brief
 *  \author Jason Kraftcheck
 */

#include "Mesquite.hpp"
#include "TMetricBarrier.hpp"
#include "TPower2.hpp"
#include "MsqMatrix.hpp"
#include "TMPDerivs.hpp"
#include "MsqError.hpp"
#include "TMPCommon.hpp"

namespace MBMesquite
{

std::string TPower2::get_name() const
{
    return "sqr(" + mMetric->get_name() + ')';
}

TPower2::~TPower2() {}

template < unsigned DIM >
inline bool TPower2::eval( const MsqMatrix< DIM, DIM >& T, double& result, MsqError& err )
{
    bool rval = mMetric->evaluate( T, result, err );
    MSQ_ERRZERO( err );
    result *= result;
    return rval;
}

template < unsigned DIM >
inline bool TPower2::grad( const MsqMatrix< DIM, DIM >& T,
                           double& result,
                           MsqMatrix< DIM, DIM >& deriv_wrt_T,
                           MsqError& err )
{
    bool rval = mMetric->evaluate_with_grad( T, result, deriv_wrt_T, err );
    MSQ_ERRZERO( err );
    deriv_wrt_T *= 2 * result;
    result *= result;
    return rval;
}

template < unsigned DIM >
inline bool TPower2::hess( const MsqMatrix< DIM, DIM >& T,
                           double& result,
                           MsqMatrix< DIM, DIM >& deriv_wrt_T,
                           MsqMatrix< DIM, DIM >* second_wrt_T,
                           MsqError& err )
{
    bool rval = mMetric->evaluate_with_hess( T, result, deriv_wrt_T, second_wrt_T, err );  //
    MSQ_ERRZERO( err );
    hess_scale( second_wrt_T, 2 * result );
    pluseq_scaled_outer_product( second_wrt_T, 2.0, deriv_wrt_T );
    deriv_wrt_T *= 2 * result;
    result *= result;
    return rval;
}

TMP_T_TEMPL_IMPL_COMMON_ERR( TPower2 )

}  // namespace MBMesquite
